I have found the poly's on these models are reliable, but can sometimes cause noise / code issues.
Removing the laser can be a pain in the ass, if you don't already know how to do it. (Skip this if you already do, but it may help someone else in the future):
You will need to remove the internal tray, toner hopper, PSU and metal plate underneath the internal tray (with power disconnected, of couse, and watch out for the capacitors); you will need a small screwdriver for this job, unpeal the two seals underneath where the hopper sits to get to the two laser screws, remove the single exposed screw, and disconnect the two cables. The LSU should pull towards where the PSU was sitting. Removing the poly is simple after that.
The first time I did this, I didn't read the manual; to know about the two hopper screws, and ended up removing the entire scanner section. Didn't RTFM when I needed to RTFM.
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